Selected financial information for Brookeville Manufacturing is presented in the following table (000s omitted). Sales revenue $4200 Purchases of direct materials $490 Direct labor $500 Manufacturing overhead $640 Operating expenses $700 Beginning raw materials $270 inventory Ending raw materials inventory $200 Beginning work in process $360 inventory Ending work in process $410 inventory Beginning finished goods $320 inventory Ending finished goods inventory $260 What was operating income? $1790 $3500 $2910 $4200